Fluorescent substrate, light source device, and projection display unit

Abstract

A fluorescent substrate according to one embodiment of the present disclosure includes: a substrate that is configured in a rotatable manner; a fluorescent layer disposed in a center of the substrate; and a fixing layer that fixes a portion of a surface on side on which the fluorescent layer is located of the substrate and a portion of a surface on side on which the substrate is located of the fluorescent layer to each other. Thus, in a case where warpage occurs in the substrate due to a stress caused by thermal expansion arising in each of the fluorescent layer and the substrate, it is possible to reduce an amount of displacement of the fluorescent layer.

The invention claimed is: 
     
       1. A fluorescent substrate, comprising:
 a substrate that is configured in a rotatable manner; 
 a fluorescent layer in a center of the substrate; and 
 a fixing layer that fixes a portion of a surface on a side on which the fluorescent layer is located of the substrate and a portion of a surface on a side on which the substrate is located of the fluorescent layer to each other. 
 
     
     
       2. The fluorescent substrate according to  claim 1 , wherein the fixing layer includes one of an organic adhesive material, an inorganic adhesive material, a low-melting-point glass, or a solder. 
     
     
       3. The fluorescent substrate according to  claim 1 , wherein
 each of the substrate and the fluorescent layer is in a circular disk shape, 
 the fluorescent layer is in a concentric manner with the substrate, and 
 the fixing layer is in a ring-like shape, and is at a position facing an outer edge of the fluorescent layer. 
 
     
     
       4. The fluorescent substrate according to  claim 3 , further comprising a thermally-conductive material, wherein
 the fixing layer has one ring-like section at a position facing the outer edge of the fluorescent layer, and 
 the thermally-conductive material only comes in contact with the substrate and the fluorescent layer inside an opening of the ring-like section, and has no function of joining the substrate and the fluorescent layer with each other. 
 
     
     
       5. The fluorescent substrate according to  claim 3 , further comprising a thermally-conductive material, wherein
 the fixing layer has two ring-like sections in a concentric manner at a position facing the outer edge of the fluorescent layer, and 
 the thermally-conductive material only comes in contact with the substrate and the fluorescent layer inside a clearance between the two ring-like sections, and has no function of joining the substrate and the fluorescent layer with each other. 
 
     
     
       6. A fluorescent substrate, comprising:
 a substrate that is configured in a rotatable manner; and 
 a fluorescent layer in a center of the substrate, wherein 
 the substrate has a junction surface that joins a portion of a surface on a side on which the fluorescent layer is located of the substrate and a portion of a surface on a side on which the substrate is located of the fluorescent layer with each other. 
 
     
     
       7. The fluorescent substrate according to  claim 6 , wherein the junction surface is joined with the fluorescent layer with use of one of normal-temperature bonding or optical contact. 
     
     
       8. The fluorescent substrate according to  claim 6 , wherein
 the substrate has a ring-like convex section at a position facing an outer edge of the fluorescent layer, and 
 a top surface of the convex section serves as the junction surface. 
 
     
     
       9. The fluorescent substrate according to  claim 6 , wherein
 the substrate has a concave section at a position excluding a position facing an outer edge of the fluorescent layer in a region facing the fluorescent layer, and 
 a portion, corresponding to a circumferential edge of the concave section, of the substrate serves as the junction surface. 
 
     
     
       10. A light source device, comprising:
 a substrate that is configured in a rotatable manner; 
 a fluorescent layer in a center of the substrate; 
 a fixing layer that fixes a portion of a surface on a side on which the fluorescent layer is located of the substrate and a portion of a surface on a side on which the substrate is located of the fluorescent layer to each other; and 
 a light source that irradiates the fluorescent layer with excitation light. 
 
     
     
       11. A light source device, comprising:
 a substrate that is configured in a rotatable manner; 
 a fluorescent layer in a center of the substrate; and 
 a light source that irradiates the fluorescent layer with excitation light, wherein 
 the substrate has a junction surface that joins a portion of a surface on a side on which the fluorescent layer is located of the substrate and a portion of a surface on a side on which the substrate is located of the fluorescent layer with each other. 
 
     
     
       12. A projection display unit, comprising:
 a substrate that is configured in a rotatable manner; 
 a rotationally symmetric fluorescent layer in a center of the substrate; 
 a fixing layer that fixes a portion of a surface on a side on which the fluorescent layer is located of the substrate and a portion of a surface on a side on which the substrate is located of the fluorescent layer to each other; 
 a light source that irradiates the fluorescent layer with excitation light; 
 a light modulator that generates image light by modulating the excitation light emitted from the light source on a basis of an image signal; and 
 a projector that projects the image light generated by the light modulator. 
 
     
     
       13. A projection display unit, comprising:
 a substrate that is configured in a rotatable manner; 
 a rotationally symmetric fluorescent layer in a center of the substrate; 
 a light source that irradiates the fluorescent layer with excitation light; 
 a light modulator that generates image light by modulating the excitation light emitted from the light source on a basis of an image signal; and 
 a projector that projects the image light generated by the light modulator, wherein 
 the substrate has a junction surface that joins a portion of a surface on a side on which the fluorescent layer is located of the substrate and a portion of a surface on a side on which the substrate is located of the fluorescent layer with each other.